Tower packing element, tower packing, and packing tower and mixer comprising the same

ABSTRACT

A tower packing element ( 100 ), a tower packing ( 300 ), a packing tower, and a mixer comprising the tower packing element ( 100 ) are provided. The tower packing element ( 100 ) are manufactured by a deformed plate and comprises a plurality of strip assemblies ( 10 ) arranged along a longitudinal direction of the tower packing element ( 100 ) and a connecting plate portion ( 20 ) connected between adjacent strip assemblies ( 10 ). Each of the strip assemblies ( 10 ) defines a central passage ( 30 ) therein, and the central passage ( 30 ) is extended in a lateral direction of the tower packing element ( 100 ). The connecting plate portion ( 20 ) is extended along the lateral direction of the tower packing element ( 100 ). The adjacent strip assemblies ( 10 ) and the connecting plate portion ( 20 ) connected therebetween define a side passage ( 40 ) parallel to the central passage ( 30 ).

CROSS REFERENCE TO RELATED APPLICATION

This U.S. application is a continuation application of U.S. patentapplication Ser. No. 14/759,830, filed on Jul. 8, 2015, which claimspriority under 35 U.S.C. 371 to, and is a U.S. National Phaseapplication of, the International Patent Application No.PCT/CN2014/072575, filed on Feb. 26, 2014, which claims the benefit ofprior Chinese Application No. 201310389841.1, filed on Aug. 30, 2013.The entire contents of the above-mentioned patent applications areincorporated by reference as part of the disclosure of this U.S.application.

FIELD

Embodiments of the present invention generally relate to chemicaldevices, more particularly to a tower packing element, a tower packingcomprising the tower packing element, a packing tower and a mixercomprising the tower packing.

BACKGROUND

Packing towers are used to transfer a gas-liquid stream or aliquid-liquid stream by means of continuous contact. Tower packings inthe packing tower play a key role in mass or heat transfer, and theflowing passages of the gas-liquid stream or the liquid-liquid stream,as well as the transferring method are determined by the tower packings.There are two types of tower packings, including a random tower packingand a structured tower packing. The random tower packing is composed ofa plurality of tower packings packed in the packing tower randomly. Aspassages for gas and liquid in the random tower packing is not straight,the flowing distance for the gas or liquid stream in the packing towerare long. Further, the random tower packing holds a large quantity ofliquid, such that a contact time between the gaseous phase and theliquid phase of the stream is long, which increases the turbulentintensity of the contacting surface between the gaseous phase and theliquid phase of the stream, and finally improves the mass or heattransferring efficiency. As described above, the random tower packing isadvantageous in an absorption process with chemical reactions or with acondition of a high pressure system or a large quantity of liquidloading. However, the random tower packing has a small specific surfacearea which causes a great resistance during the flowing of the stream.In this condition, a diameter-height ratio of the random tower packingis increased so that the random tower packings may be achieved regularlyas far as possible. In addition, a wall of the tower packing is furtherbroadened in order to reduce a pressure drop of the random tower packingand improve the processing capacity and efficiency of the random towerpacking.

The structured tower packing is composed of a plurality of towerpackings arranged in the packing tower regularly and each having auniform shape. The structured tower packings define a regular passagefor the gas stream and the liquid stream, such that the pressure droptherein is small. Further, compared with the random tower packing withan equal specific surface area, the structured tower packing holds asmaller quantity of liquid and has a higher processing capacity.

SUMMARY

Embodiments of the present invention seek to solve at least one of theproblems existing in the prior art to at least some extent. Accordingly,an object of the present invention is to provide a tower packingelement, which may increase the amount of liquid held by the towerpacking, so as to increase the contact time between the gaseous phaseand the liquid phase of a transferred gas-liquid stream or between theliquid phases of a transferred liquid-liquid stream and improve theprocessing capacity of the tower packing.

Another object of the present invention is to a tower packing having thetower packing element.

A further object of the present invention is to provide a packing toweror a mixer having the tower packing.

According to embodiments of a first aspect of the present invention, atower packing element is provided. The tower packing element ismanufactured by a deformed plate and comprises: a plurality of stripassemblies arranged along a longitudinal direction of the tower packingelement, each of the strip assemblies defining a central passagetherein, and the central passage being extended in a lateral directionof the tower packing element, and a connecting plate portion connectedbetween adjacent strip assemblies and extended along the lateraldirection of the tower packing element, wherein the adjacent stripassemblies and the connecting plate portion connected therebetweendefine a side passage parallel to the central passage.

According to embodiments of the present invention, the tower packingelement has a structure similar to that of a random tower packing. Withthe tower packing element according to embodiments of the presentinvention, the amount of liquid held by the tower packing as well as thecontact time between the gaseous phase and the liquid phase of thetransferred gas-liquid stream or between the liquid phases of thetransferred liquid-liquid stream are both increased, thus improving themass/heat transferring efficiency of the tower packing. Meanwhile, withthe central passage and the side passage being spaced apart from eachother and the tower packing elements arranged regularly like astructured tower packing, the flowing passage for the gas or liquid maybe defined. Therefore, the pressure drop in the tower packing isreduced, and the processing capacity of the tower packing is furtherimproved.

In some embodiments, each of the strip assemblies comprises a pluralityof strip units arranged along the lateral direction of the tower packingelement.

According to an embodiment of the present invention, the strip unitcomprises a first edge and a second edge positioned at opposite sides ofthe connecting plate portion in a thickness direction of the towerpacking element respectively and distributed staggerly along the lateraldirection of the tower packing element, in which the first and secondedges are parallel to each other.

In some embodiments, projections of the first edge and the second edgeon a reference plane parallel to the first edge and the second edgedefine a first region, in which the first region has a shape of polygonhaving more than three sides.

Alternatively, the first region has a substantially rhombic shape orsubstantially hexagonal shape.

In an embodiment of the present invention, the polygon has at least twosides transitioned into each other via an arc.

In an embodiment of the present invention, the polygon has at least onearc-shaped side.

In an embodiment of the present invention, projections of the first edgeand the second edge on a reference plane parallel to the first edge andthe second edge define a first region, in which the first region has acircular shape or a substantially oval shape.

According an embodiment of the present invention, the strip unit furthercomprises a third edge and a fourth edge disposed staggerly along thelateral direction of the tower packing element, and positioned atopposite sides of the connecting plate portion in the thicknessdirection of the tower packing element and between the first edge andthe second edge, in which the third and fourth edges are parallel toeach other.

Alternatively, the second edge and the third edge are at the same sideof the connecting plate portion in the thickness direction of the towerpacking element, and the first edge and the fourth edge are at the sameside of the connecting plate portion in the thickness direction of thetower packing element.

Alternatively, projections of the third edge and the fourth edge on thereference plane parallel to the first edge and the second edge define asecond region, in which the second region has a shape of polygon havingmore than three sides, and the second region is partly overlapped withthe first region.

In an embodiment of the present invention, the first region has a shapeof a first tetragon, and the second region has a shape of a secondtetragon, in which one diagonal of the first tetragon is coincided withone diagonal of the second tetragon, and the first tetragon and thesecond tetragon are symmetrical with respect to the one diagonalrespectively.

In an embodiment of the present invention, the first tetragon or thesecond tetragon has at least two sides transitioned into each other viaan arc.

In an embodiment of the present invention, the first tetragon or thesecond tetragon has at least one arc-shaped side.

Alternatively, projections of the third edge and the fourth edge on thereference plane parallel to the first edge and the second edge define asecond region, in which the second region has a shape consisting of twodiamonds connected via a connecting side.

In an embodiment of the present invention, at least one of the twodiamonds has at least two sides transitioned into each other via an arc.

In an embodiment of the present invention, at least one of the twodiamonds has at least one arc-shaped side.

According to an embodiment of the present invention, the first to fourthedges have the same width in the lateral direction of the tower packingelement.

According to an embodiment of the present invention, an angle between anextending direction of the first edge and the lateral direction of thetower packing element ranges from 5 to 175 degrees.

According to an embodiment of the present invention, the deformed plateis a metal sheet, a plastic sheet, a ceramic sheet, or a metal mesh.

The tower packing element according to the present invention may improvethe mass transferring efficiency, reduce the pressure drop and improvethe processing capacity of the tower packing.

According to a second aspect of the present invention, a tower packingis provided. The tower packing comprises a plurality of tower packingelements described above, in which the plurality of tower packingelements are arranged parallel to each other in a thickness direction ofthe tower packing element, and the extending directions of the centralpassages of the adjacent tower packing elements are intersected.

According to a third aspect of the present invention, a packing tower isprovided. The packing tower comprises: a tower body and a plurality oftower packings described above, and the tower packings are configured totransfer mass or heat of a gas-liquid stream or a liquid-liquid streamand arranged in the tower body along a flowing direction of thegas-liquid stream or the liquid-liquid stream, an angle between anextending direction of the central passage of the tower packing elementand the flowing direction of the gas-liquid stream or the liquid-liquidstream is in a range of 0 to 180 degrees, and the longitudinaldirections of the tower packing elements of the adjacent tower packingsare intersected.

Alternatively, the extending directions of the central passages of theadjacent tower packing elements of each tower packing are inclined andsymmetrical with respect to the flowing direction of the gas-liquidstream or the liquid-liquid stream.

According to a fourth aspect of the present invention, a mixer isprovided. The mixer comprises: a mixer body and at least one towerpacking described above, the tower packing is disposed in the mixer bodyand configured to mix a stream, in which the stream flows through thecentral passage and the side passage along the same direction.

Additional aspects and advantages of embodiments of present inventionwill be given in part in the following descriptions, become apparent inpart from the following descriptions, or be learned from the practice ofthe embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects and advantages of embodiments of the presentinvention will become apparent and more readily appreciated from thefollowing descriptions made with reference to the accompanying drawings,in which:

FIG. 1 is a schematic perspective view of a tower packing element for atower packing according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the tower packing element in FIG. 1viewed from a direction A;

FIG. 3a is a cross-sectional view of the tower packing element in FIG. 2viewed from a direction D;

FIG. 3b is a cross-sectional view of the tower packing element in FIG. 2viewed from a direction E;

FIG. 4 is a schematic perspective view of a tower packing elementaccording to another embodiment of the present invention;

FIG. 5 is a cross-sectional view of the tower packing element in FIG. 4viewed from a direction A;

FIG. 6 is a cross-sectional view of the tower packing element in FIG. 4according to another embodiment of the present invention viewed from adirection A;

FIG. 7 is a cross-sectional view of the tower packing element in FIG. 4according to a further embodiment of the present invention viewed from adirection A;

FIG. 8 is a cross-sectional view of the tower packing element in FIG. 4according to a still further embodiment of the present invention viewedfrom a direction A;

FIG. 9a is a cross-sectional view of the tower packing element in FIG.5, FIG. 6, FIG. 7 or FIG. 8 viewed from a direction D;

FIG. 9b is a cross-sectional view of the tower packing element in FIG.5, FIG. 6, FIG. 7 or FIG. 8 viewed from a direction E;

FIG. 10 is a cross-sectional view of a tower packing element accordingto an embodiment of the present disclosure viewed from a direction A;

FIG. 11 is a cross-sectional view of a tower packing element accordingto another embodiment of the present disclosure viewed from a directionA;

FIG. 12a is a cross-sectional view of the tower packing element in FIG.10 or FIG. 11 viewed from a direction D;

FIG. 12b is a cross-sectional view of the tower packing element in FIG.10 or FIG. 11 viewed from a direction E; and

FIG. 13 is a schematic partial view of a packing tower according to anembodiment of the present invention.

DETAILED DESCRIPTION

Reference will be made in detail to embodiments of the presentinvention. The embodiments described herein with reference to drawingsare explanatory, illustrative, and used to generally understand thepresent invention. The embodiments shall not be construed to limit thepresent invention. The same or similar elements and the elements havingsame or similar functions are denoted by like reference numeralsthroughout the descriptions.

In the specification, unless specified or limited otherwise, relativeterms such as “longitudinal”, “lateral”, “a direction of thickness”,“front”, “rear”, “right”, “left”, “inner”, “outer”, as well asderivative thereof (e.g., “horizontally”, “downwardly”, “upwardly”,etc.) should be construed to refer to the orientation as then describedor as shown in the drawings under discussion. These relative terms arefor convenience of description and do not require that the presentinvention be constructed or operated in a particular orientation. Inaddition, terms such as “first” and “second” are used herein forpurposes of description and are not intended to indicate or implyrelative importance or significance. In the description of the presentinvention, “a plurality of” relates to two or more than two.

Unless specified or limited otherwise, the terms “mounted,” “connected,”“supported,” and “coupled” and variations thereof are used broadly andencompass both direct and indirect mountings, connections, supports, andcouplings. Further, “connected” and “coupled” are not restricted tophysical or mechanical connections or couplings.

The tower packing element 100 for a tower packing will be describedbelow with reference to FIGS. 1-13.

According to embodiments of the present invention, a tower packingelement 100 for a tower packing is provided. The tower packing element100 is manufactured by a deformed plate. In an embodiment, the deformedplate is a metal sheet, a plastic sheet, a ceramic sheet, or a metalmesh.

As shown in FIG. 1, the tower packing element 100 includes: a pluralityof strip assemblies 10 arranged along a longitudinal direction of thetower packing element 100 and a connecting plate portion 20 connectedbetween adjacent strip assemblies 10 and extended along a lateraldirection of the tower packing element 100. Each of the strip assemblies100 defines a central passage 30 therein, and the central passage 30 isextended in the lateral direction of the tower packing element 100. Theadjacent strip assemblies 100 and the connecting plate portion 20connected therebetween define a side passage 40 parallel to the centralpassage 30. A person having ordinary skill in the art will understandthat the lateral direction is perpendicular to the longitudinaldirection.

The tower packing element 100 according to embodiments of the presentinvention has a structure similar to that of a random tower packing inthe related art, thus improving the amount of liquid held by the towerpacking element 100 and a contact time between the gaseous phase and theliquid phase of the transferred gas-liquid stream or between the liquidphases of the transferred liquid-liquid stream, so as to improve theprocessing capacity of the tower packing element 100. In addition, withthe central passage 30 and the side passage 40 being spaced apart fromeach other and arranged in a similar manner to a structured towerpacking in the related art, flowing passages for liquid and gas areregulated in the tower packing. In this way, a pressure drop in thetower packing is reduced, thus improving the processing capacity of thetower packing element 100. It is to be understood that, the random towerpacking and the structured tower packing are known to a person havingordinary skill in the art, such that detailed description thereof willbe omitted herein.

As shown in FIG. 1, each of the strip assemblies 10 includes a pluralityof strip units 1 arranged along the lateral direction of the towerpacking element 100.

Referring to FIGS. 1-3 b, the strip unit 1 includes a first edge 11 anda second edge 12. The first and second edges 11, 12 are positioned atopposite sides of the connecting plate portion 20 in a thicknessdirection of the tower packing element 100 respectively and distributedstaggerly along the lateral direction of the tower packing element 100.The first and second edges 11, 12 are parallel to each other. A personhaving ordinary skill in the art will understand that the thicknessdirection is perpendicular to the plane defined by the lateral directionand the longitudinal direction.

In some embodiments, projections of the first edge 11 and the secondedge 12 on a reference plane parallel to the first and second edgesdefine a first region 15.

The shape of the first region 15 is not limited. For example, the firstregion 15 may have a shape of polygon having more than three sides.Alternatively, the first region 15 may have a substantially rhombicshape, as shown in FIG. 2 and FIG. 7. In an embodiment, the first region15 has a substantially hexagonal shape, as shown in FIG. 5 and FIG. 8.In some embodiments, the first region 15 may have an irregularlytetragonal shape or a rhomboid shape, as shown in FIG. 10 and FIG. 11.For example and without limits, the first region 15 may have a circularshape as shown in FIG. 6 or a substantially oval shape (not shown).

In an embodiment of the present invention, when the first region 15 hasa shape of a polygon, the polygon has at least two sides transitionedinto each other via an arc. Specifically, as shown in FIGS. 2, 5, 7-8,the first edge 11 includes at least two first straight segments 11B andat least one first arc-shaped segment 11A connected between adjacentfirst straight segments 11B, and the second edge 12 includes at leasttwo second straight segments 12B and at least one second arc-shapedsegment 12A connected between adjacent second straight segments 12B.

As shown in FIG. 2, the first region 15 has a substantially rhombicshape. The first edge 11 includes two first straight segments 11B andone first arc-shaped segment 11A connected between the two firststraight segments 11B, and the second edge 12 includes two secondstraight segments 12B and one second arc-shaped segment 12A connectedbetween the two second straight segments 12B.

As shown in FIG. 5, the first region 15 has a substantially hexagonalshape. The first edge 11 includes three first straight segments 11B andtwo first arc-shaped segment 11A each connected between two adjacentfirst straight segments 11B, and the second edge 12 includes threesecond straight segments 12B and two second arc-shaped segment 12A eachconnected between two adjacent second straight segments 12B.

In some embodiments, the polygon has at least one arc-shaped side.Specifically, as shown in FIGS. 4-5, the first straight edge 11B and thesecond straight edge 12B are arc-shaped sides.

As shown in FIGS. 10-11, the strip unit 1 further includes a third edge13 and a fourth edge 14. The third and fourth edges 13, 14 are disposedstaggerly along the lateral direction of the tower packing element 100,and positioned at opposite sides of the connecting plate portion 20 inthe thickness direction of the tower packing element 100 and between thefirst edge 11 and the second edge 12, as shown in FIGS. 12a -12 b. Inaddition, the third and fourth edges 13, 14 are parallel to each other.

As shown in FIGS. 10-11, the second edge 12 and the third edge 13 are atthe same side of the connecting plate portion 20 in the thicknessdirection of the tower packing element 100, and the first edge 11 andthe fourth edge 14 are at the same side of the connecting plate portion20 in the thickness direction of the tower packing element 100.

In some embodiments, projections of the third edge 13 and the fourthedges 14 on a reference plane parallel to the first edge 11 and thesecond edge 12 define a second region 16. The second region 16 has ashape of polygon having more than three sides, and the second region 16is partly overlapped with the first region 15.

As shown in FIGS. 10 and 11, the first region 15 has a shape of a firsttetragon, and the second region 16 has a shape of a second tetragon. Onediagonal of the first tetragon is coincided with one diagonal of thesecond tetragon, and the first and second tetragons are symmetrical withrespect to the one diagonal respectively.

In some embodiments, each of the first and second tetragons has at leasttwo sides transitioned into each other via an arc. Specifically, asshown in FIGS. 10-11, the first edge 11 includes two first straightsegments 11B and one first arc-shaped segment 11A connected between thetwo first straight segments 11B, the second edge 12 includes two secondstraight segments 12B and one second arc-shaped segment 12A connectedbetween the two second straight segments 12B, the third edge 13 includestwo third straight segments 13B and one third arc-shaped segment 13Aconnected between the two third straight segments 13B, and the fourthedge 14 includes two fourth straight segments 14B and one fourtharc-shaped segment 14A connected between the two fourth straightsegments 14B.

In some embodiments, each of the first tetragon and/or the secondtetragon has at least one arc-shaped side.

As shown in FIGS. 5-8, projections of the third edge 13 and the fourthedge 14 on a reference plane parallel to the first edge 11 and thesecond edge 12 define a second region 16, and the second region 16 has ashape consisting of two diamonds connected via a connecting side 161. Inother words, as shown in FIGS. 5-8, the third edge 13 and the fourthedge 14 are disposed staggerly in the reference plane, thus forming asubstantially X-shaped structure.

In some embodiments, at least one of the two diamonds has at least twosides transitioned into each other via an arc. Specifically, as shown inFIGS. 5-8, the third edge 13 includes two third straight segments 13Band one third arc-shaped segment 13A connected between the two thirdstraight segments 13B, and the fourth edge 14 includes two fourthstraight segments 14B and one fourth arc-shaped segment 14A connectedbetween the two fourth straight segments 14B.

In some embodiments, at least one of the two diamonds has at least onearc-shaped side, as shown in FIG. 5.

The first to fourth edges 11 to 14 have the same width in the lateraldirection of the tower packing element 100, as shown in FIGS. 3a -3 b, 9a-9 b, and 12 a-12 b.

In some embodiments, an angle between an extending direction of thefirst edge 11 and the lateral direction of the tower packing element 100ranges from 5 to 175 degrees, i.e., an angle between the lateraldirection of the tower packing element 100 and the reference planeparallel to the first edge 11 and the second edge 12 ranges from 5 to175 degrees.

The tower packing element according to the present invention may improvethe mass transferring efficiency, reduce the pressure drop and improvethe processing capacity of the tower packing.

According to embodiments of a second aspect of the present invention, atower packing 300 is provided. The tower packing 300 includes aplurality of tower packing elements 100 described above. The pluralityof tower packing elements 100 are arranged parallel to each other in athickness direction of the tower packing element 100, and extendingdirections of the central passages 30 of adjacent tower packing elements100 are intersected, as shown in FIG. 13.

According to embodiments of a third aspect of the present invention, apacking tower is provided. The packing tower includes a tower body 200and a plurality of tower packings 300 described above. The plurality oftower packings 300 are configured to transfer mass or heat of agas-liquid stream or a liquid-liquid stream and arranged in the towerbody 200 along a flowing direction of the gas-liquid stream or theliquid-liquid stream. An angle between an extending direction of thecentral passage 30 of the tower packing element 100 and the flowingdirection of the gas-liquid stream or the liquid-liquid stream is in arange of 0 to 180 degrees, and longitudinal directions of the towerpacking elements 100 of adjacent tower packings 300 are intersected.Specifically, as shown in FIG. 13, two tower packings 300 a and 300 bare disposed adjacent to each other in an up and down direction, and thelongitudinal directions of the tower packing 300 a and the tower packing300 b are intersected.

In some embodiments, the extending directions of central passages 30 ofadjacent tower packing elements 100 of each tower packing are inclinedand symmetrical with respect to the flowing direction of the gas-liquidstream or the liquid-liquid stream. For example, in the packing towershown in FIG. 13, the flowing direction of the gas-liquid stream or theliquid-liquid stream is an axial direction of the tower body 200, i.e.,the up and down direction. The extending direction of the centralpassage 30 of the tower packing element 100 a of each tower packing 300is the lateral direction of the tower packing element 100 a, and theextending direction of the central passage 30 of the tower packingelement 100 b of the each tower packing adjacent to the tower packingelement 100 a is the lateral direction of the tower packing element 100b. The lateral directions of the tower packing element 100 a and thetower packing element 100 b are inclined oppositely to each other andsymmetrical with respect to the flowing direction of the gas-liquidstream or the liquid-liquid stream.

According to embodiments of a fourth aspect of the present invention, amixer is provided. The mixer includes a mixer body, and at least onetower packing described above. The tower packing is disposed in themixer body and configured to mix a stream. The stream flows through thecentral passage and the side passage along the same direction.

Each of the tower packing element, the tower packing, the packing tower,and the mixer according to embodiments of the present invention maycomprise other components known to a person having ordinary skill in theart, such that detailed description thereof will be omitted herein.

Reference throughout this specification to “an embodiment,” “someembodiments,” “one embodiment”, “another example,” “an example,” “aspecific example,” or “some examples,” means that a particular feature,structure, material, or characteristic described in connection with theembodiment or example is included in at least one embodiment or exampleof the present invention. Thus, the appearances of the phrases such as“in some embodiments,” “in one embodiment”, “in an embodiment”, “inanother example,” “in an example,” “in a specific example,” or “in someexamples,” in various places throughout this specification are notnecessarily referring to the same embodiment or example of the presentinvention. Furthermore, the particular features, structures, materials,or characteristics may be combined in any suitable manner in one or moreembodiments or examples.

Although explanatory embodiments have been shown and described, it wouldbe appreciated by a person having ordinary skill in the art that theabove embodiments cannot be construed to limit the present invention,and changes, alternatives, and modifications can be made in theembodiments without departing from spirit, principles and scope of thepresent invention.

What is claimed is:
 1. A tower packing element manufactured by adeformed plate and comprising: a plurality of strip assemblies arrangedalong a longitudinal direction of the tower packing element, each of thestrip assemblies defining a central passage therein, and the centralpassage being extended in a lateral direction of the tower packingelement, and a connecting plate portion connected between adjacent stripassemblies and extended along the lateral direction of the tower packingelement, wherein the adjacent strip assemblies and the connecting plateportion connected therebetween define a side passage parallel to thecentral passage; each of the strip assemblies includes a plurality ofstrip units arranged along the lateral direction of the tower packingelement; the strip unit includes: first and second edges positioned atopposite sides of the connecting plate portion in a thickness directionof the tower packing element respectively and distributed staggerlyalong the lateral direction of the tower packing element, wherein thefirst and second edges are parallel to each other; the strip unitfurther includes third and fourth edges disposed staggerly along thelateral direction of the tower packing element, and positioned atopposite sides of the connecting plate portion in the thicknessdirection of the tower packing element and between the first and secondedges, wherein the third and fourth edges are parallel to each other;projections of the first and second edges on a reference plane parallelto the first and second edges define a first region; projections of thethird and fourth edges on the reference plane parallel to the first andsecond edges define a second region, the second region is partlyoverlapped with the first region; the first region has a shape of afirst tetragon, and the second region has a shape of a second tetragon,wherein one diagonal of the first tetragon is coincided with onediagonal of the second tetragon, and the first and second tetragons aresymmetrical with respect to the one diagonal respectively.
 2. The towerpacking element according to claim 1, wherein the first tetragon or thesecond tetragon has at least two sides transitioned into each other viaan arc.
 3. The tower packing element according to claim 1, wherein thefirst tetragon or the second tetragon has at least one arc-shaped side.4. The tower packing element according to claim 1, wherein the first tofourth edges have the same width in the lateral direction of the towerpacking element.
 5. The tower packing element according to claim 1,wherein an angle between an extending direction of the first edge andthe lateral direction of the tower packing element ranges from 5 to 175degrees.
 6. The tower packing element according to claim 1, wherein thedeformed plate is a metal sheet, a plastic sheet, a ceramic sheet, or ametal mesh.
 7. The tower packing element according to claim 1, whereinthe second and third edges are at the same side of the connecting plateportion in the thickness direction of the tower packing element, and thefirst and fourth edges are at the same side of the connecting plateportion in the thickness direction of the tower packing element.
 8. Atower packing comprising a plurality of tower packing elements, whereinthe tower packing element is manufactured by a deformed plate andcomprises: a plurality of strip assemblies arranged along a longitudinaldirection of the tower packing element, each of the strip assembliesdefining a central passage therein, and the central passage beingextended in a lateral direction of the tower packing element; and aconnecting plate portion connected between adjacent strip assemblies andextended along the lateral direction of the tower packing element; theadjacent strip assemblies and the connecting plate portion connectedtherebetween define a side passage parallel to the central passage; eachof the strip assemblies includes a plurality of strip units arrangedalong the lateral direction of the tower packing element; the strip unitincludes: first and second edges positioned at opposite sides of theconnecting plate portion in a thickness direction of the tower packingelement respectively and distributed staggerly along the lateraldirection of the tower packing element, wherein the first and secondedges are parallel to each other; the strip unit further includes thirdand fourth edges disposed staggerly along the lateral direction of thetower packing element, and positioned at opposite sides of theconnecting plate portion in the thickness direction of the tower packingelement and between the first and second edges, wherein the third andfourth edges are parallel to each other; projections of the first andsecond edges on a reference plane parallel to the first and second edgesdefine a first region; projections of the third and fourth edges on thereference plane parallel to the first and second edges define a secondregion, the second region is partly overlapped with the first region;the first region has a shape of a first tetragon, and the second regionhas a shape of a second tetragon, wherein one diagonal of the firsttetragon is coincided with one diagonal of the second tetragon, and thefirst and second tetragons are symmetrical with respect to the onediagonal respectively; and the plurality of tower packing elements arearranged parallel to each other in a thickness direction of the towerpacking element, and extending directions of the central passages ofadjacent tower packing elements are intersected.
 9. A packing towercomprising: a tower body, and a plurality of tower packings configuredto transfer mass or heat of a gas-liquid stream or a liquid-liquidstream and arranged in the tower body along a flowing direction of thegas-liquid stream or the liquid-liquid stream, wherein the tower packingcomprises a plurality of tower packing elements, the tower packingelement is manufactured by a deformed plate and comprises: a pluralityof strip assemblies arranged along a longitudinal direction of the towerpacking element, each of the strip assemblies defining a central passagetherein, and the central passage being extended in a lateral directionof the tower packing element; and a connecting plate portion connectedbetween adjacent strip assemblies and extended along the lateraldirection of the tower packing element; the adjacent strip assembliesand the connecting plate portion connected therebetween define a sidepassage parallel to the central passage; each of the strip assembliesincludes a plurality of strip units arranged along the lateral directionof the tower packing element; the strip unit includes: first and secondedges positioned at opposite sides of the connecting plate portion in athickness direction of the tower packing element respectively anddistributed staggerly along the lateral direction of the tower packingelement, wherein the first and second edges are parallel to each other;the strip unit further includes third and fourth edges disposedstaggerly along the lateral direction of the tower packing element, andpositioned at opposite sides of the connecting plate portion in thethickness direction of the tower packing element and between the firstand second edges, wherein the third and fourth edges are parallel toeach other; projections of the first and second edges on a referenceplane parallel to the first and second edges define a first region;projections of the third and fourth edges on the reference planeparallel to the first and second edges define a second region, thesecond region is partly overlapped with the first region; the firstregion has a shape of a first tetragon, and the second region has ashape of a second tetragon, wherein one diagonal of the first tetragonis coincided with one diagonal of the second tetragon, and the first andsecond tetragons are symmetrical with respect to the one diagonalrespectively; the plurality of tower packing elements are arrangedparallel to each other in a thickness direction of the tower packingelement, and extending directions of the central passages of adjacenttower packing elements are intersected; and an angle between anextending direction of the central passage of the tower packing elementand the flowing direction of the gas-liquid stream or the liquid-liquidstream is in a range of 0 to 180 degrees, and longitudinal directions ofthe tower packing elements of adjacent tower packings are intersected.10. The tower according to claim 9, wherein the extending directions ofcentral passages of adjacent tower packing elements of each towerpacking are inclined and symmetrical with respect to the flowingdirection of the gas-liquid stream or the liquid-liquid stream.
 11. Amixer comprising: a mixer body, and at least one tower packing disposedin the mixer body and configured to mix a stream, wherein the streamflows through the central passage and the side passage along the samedirection, and wherein the tower packing comprises a plurality of towerpacking elements, wherein the tower packing element is manufactured by adeformed plate and comprises: a plurality of strip assemblies arrangedalong a longitudinal direction of the tower packing element, each of thestrip assemblies defining a central passage therein, and the centralpassage being extended in a lateral direction of the tower packingelement; and a connecting plate portion connected between adjacent stripassemblies and extended along the lateral direction of the tower packingelement; the adjacent strip assemblies and the connecting plate portionconnected therebetween define a side passage parallel to the centralpassage; each of the strip assemblies includes a plurality of stripunits arranged along the lateral direction of the tower packing element;the strip unit includes: first and second edges positioned at oppositesides of the connecting plate portion in a thickness direction of thetower packing element respectively and distributed staggerly along thelateral direction of the tower packing element, wherein the first andsecond edges are parallel to each other; the strip unit further includesthird and fourth edges disposed staggerly along the lateral direction ofthe tower packing element, and positioned at opposite sides of theconnecting plate portion in the thickness direction of the tower packingelement and between the first and second edges, wherein the third andfourth edges are parallel to each other; projections of the first andsecond edges on a reference plane parallel to the first and second edgesdefine a first region; projections of the third and fourth edges on thereference plane parallel to the first and second edges define a secondregion, the second region is partly overlapped with the first region;the first region has a shape of a first tetragon, and the second regionhas a shape of a second tetragon, wherein one diagonal of the firsttetragon is coincided with one diagonal of the second tetragon, and thefirst and second tetragons are symmetrical with respect to the onediagonal respectively; and the plurality of tower packing elements arearranged parallel to each other in a thickness direction of the towerpacking element, and extending directions of the central passages ofadjacent tower packing elements are intersected.